120=3x+4x+x

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Solution for 120=3x+4x+x equation: 



120=3x+4x+x

We move all terms to the left:

120-(3x+4x+x)=0

We add all the numbers together, and all the variables

-(+8x)+120=0

We get rid of parentheses

-8x+120=0

We move all terms containing x to the left, all other terms to the right

-8x=-120

x=-120/-8

x=+15

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